Use ChainList to add blockchains to MetaMask
https://chainlist.org/
Multi-Chain
ETH Goerli, Optimistic Goerli, Polygon Mumbai, Moonbase Alpha (Must have Twitter with 50+ followers)
https://faucet.paradigm.xyz/
Arbitrum, Avalanche, Base Goerli, ETH Goerli, BSC, Optimism, Polygon, Solana
https://faucet.quicknode.com
Arbitrum Goerli
https://faucet.triangleplatform.com/arbitrum/goerli
Chainlink LINK (AVAX, Base, BNB, Ethereum, Fantom, Klayton, Polygon Testnets)
https://faucets.chain.link/
Ethereum Goerli Testnet
https://goerlifaucet.com/
https://fauceth.komputing.org/?chain=5
https://coinbase.com/faucets/ethereum-goerli-faucet
https://faucet.paradigm.xyz/
https://faucet.quicknode.com/ethereum/goerli
https://faucetlink.to/goerli
Ethereum Sepolia Testnet
https://sepoliafaucet.com/ (1 ETH)
https://faucet-sepolia.rockx.com/
https://sepolia-faucet.pk910.de/ (You have to mine it in browser)
https://www.infura.io/faucet (0.5 ETH)
Fantom Opera Testnet
https://faucet.fantom.network/
Mantle
https://faucet.testnet.mantle.xyz/
https://discord.com/channels/993846798382805002/1064730432777764944
Moonbeam Alpha
https://apps.moonbeam.network/moonbase-alpha/faucet/
Polygon Mumbai Testnet
https://mumbaifaucet.com/
Shardeum Testnets
Liberty Faucet 2.1 https://discord.com/channels/933959587462254612/1031497272191627284
https://faucet.liberty20.shardeum.org/
Sphinx Faucet 1.1 https://discord.com/channels/933959587462254612/1070780355931541514
https://faucet-sphinx.shardeum.org/
Starknet Goerli Testnet
https://faucet.goerli.starknet.io/